Abstract：Based on field monitoring data of more than fifty two-lane highway tunnels，the data of convergence displacements and vault settlements were analyzed through statistical method. The deformation characteristics of different surrounding rock levels from II to V with time were also studied，and the stable time was proposed for surrounding rock from excavation to stabilization. The relationship between levels and stable time of surrounding rock was defined，which provided basis for evaluation of surrounding rock and construction time of secondary lining.
